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2006 First International Conference on Communications and Networking in China最新文献

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A Scalable Framework for QOS Guarantees 一个可扩展的QOS保证框架
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344775
Lianming Zhang, Zhigang Chen, Xiaoheng Deng, Guosheng Huang, L. Yao
{"title":"A Scalable Framework for QOS Guarantees","authors":"Lianming Zhang, Zhigang Chen, Xiaoheng Deng, Guosheng Huang, L. Yao","doi":"10.1109/CHINACOM.2006.344775","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344775","url":null,"abstract":"In order to support the QoS of the network, a scalable framework based on the deterministic QoS guarantees was proposed. On the basis of the edge-core network model, we introduced the notion of flow and micro-flow, a two-layer scheduling model based on the arrival curves and service curves, and derived the upper bound on the queue length, the queue delay, the end-to-end delay/jitter, and effective bandwidth using network calculus. In this paper, some examples of a guarantee service based on the proposed framework were analyzed. Results show that the framework is highly scalable, and can be used in the designing of the communication network with QoS guarantees.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126220435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Wireless Data Access in Mobile Hotspots: A Simulation Study 移动热点中的无线数据访问:仿真研究
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344902
Kunwoo Park, Sangheon Pack, Taekyoung Kwon, Yanghee Choi
{"title":"Wireless Data Access in Mobile Hotspots: A Simulation Study","authors":"Kunwoo Park, Sangheon Pack, Taekyoung Kwon, Yanghee Choi","doi":"10.1109/CHINACOM.2006.344902","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344902","url":null,"abstract":"Mobile hotspots enable ubiquitous Internet access while users are on-board a vehicle. In this paper, we investigate wireless data access applications with strong consistency in mobile hotspots. Through extensive simulations, we quantify the performances of two well-known strongly consistent data access algorithms: poll-each-read (PER) and callback (CB). We develop a comprehensive simulation model that considers wireless link characteristics in mobile hotspots. Simulation results demonstrate the access-to-update ratio is an important factor to determine the performances of PER and CB. In addition, the effects of cache size, data access pattern, and wireless link bandwidth on the wireless data access algorithms are analyzed. Finally, valuable observations for performance optimizations are given.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125699712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Principal Component Analysis of Mobility Data from an Operational GPRS Network 实际GPRS网络移动数据的主成分分析
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344731
C. Dumard, F. Ricciato, T. Zemen
{"title":"Principal Component Analysis of Mobility Data from an Operational GPRS Network","authors":"C. Dumard, F. Ricciato, T. Zemen","doi":"10.1109/CHINACOM.2006.344731","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344731","url":null,"abstract":"We present a preliminary analysis of mobility data collected from an operational GPRS network. The input data are time-series counting the number of mobile stations present in each of 126 sample routing areas at equally spaced instants (5 min) during one full week. The time-series were extracted from packet-level traces captured by passively monitoring a subset of the Gb links of the network of Mobilkom Austria AG & Co KG during October 2004. We apply the principal component analysis (PCA) to this dataset. The PCA offers a simple method for classifying the routing areas into two main groups, residential and business areas, plus a few \"atypical\" ones. Additionally, we address the problem of robustness of the PCA to temporary local gaps in the input data","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125807626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Performance Analysis of Orthogonal Space-Time Block Codes Over Weibull Fading Channels 正交空时分组码在威布尔衰落信道中的性能分析
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344728
Feng Xu, Dianwu Yue, Ying Zhang
{"title":"Performance Analysis of Orthogonal Space-Time Block Codes Over Weibull Fading Channels","authors":"Feng Xu, Dianwu Yue, Ying Zhang","doi":"10.1109/CHINACOM.2006.344728","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344728","url":null,"abstract":"In this paper, we consider the performance of orthogonal space-time block codes (OSTBCs) over Weibull fading channels. Based on the equivalent single input single output (SISO) model, we first present the probability density function (PDF) of the instantaneous single to noise ratio (SNR) per symbol, and then derive a close-form expression for the outage probability of OSTBCs. We also evaluate the symbol error rate (SER) for MPSK and MQAM modulations in terms of moment generating function (MGF) of instantaneous SNR which is expressed in closed-form. Moreover, we show by several numerical examples the impact of Weibull fading parameter on the performance of OSTBCs.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121595181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
An Improved Music Algorithm for Carrier Frequency Offset Estimator in the Uplink of IFDMA System IFDMA系统上行载波频偏估计的改进Music算法
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344910
Yirong Wang, Wenbo Wang
{"title":"An Improved Music Algorithm for Carrier Frequency Offset Estimator in the Uplink of IFDMA System","authors":"Yirong Wang, Wenbo Wang","doi":"10.1109/CHINACOM.2006.344910","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344910","url":null,"abstract":"The carrier frequency offsets (CFOs) in the uplink of interleaved frequency division multiple access (IFDMA) system destroy the orthogonality between users, resulting in severe multiple access interference (MAI). An improved MUSIC (multiple signal classification) algorithm is proposed to estimate CFO in this paper. In contrast to conventional MUSIC schemes which require multi-dimensional search over the parameter space, a signal structure based deterministic estimation algorithm with MUSIC is proposed for estimating the CFOs of all users simultaneously in the uplink of IFDMA system, using only one IFDMA block. Diversity schemes are also presented to improve the estimation performance. The algorithm is attractive owing to the low computational complexity and exhibiting effectiveness in frequency selective channels. The performance of the proposed scheme is confirmed by computer simulations.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134332806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mitigating Error Propagation in Decision Feedback Equalizers for VSB-Based DTV Receivers 基于vsb的数字电视接收机决策反馈均衡器中的误差传播抑制
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344770
Xiaohua Wu, Biqi Long, C. Zhou, Jinlin Wang
{"title":"Mitigating Error Propagation in Decision Feedback Equalizers for VSB-Based DTV Receivers","authors":"Xiaohua Wu, Biqi Long, C. Zhou, Jinlin Wang","doi":"10.1109/CHINACOM.2006.344770","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344770","url":null,"abstract":"Decision feedback equalizer (DFE) is an efficient scheme for suppressing intersymbol interference (ISI) in vestigial sideband (VSB) based digital TV (DTV) receivers. However, it suffers from the phenomenon of error propagation (EP). This paper considers the use of soft decisions in mitigating EP in a DFE. An optimized soft decision algorithm using the hyperbolic tangent function in the decision device is proposed to improve performance over reducing EP. Furthermore, in order to speed up the EP simulation process, a simple but effective modification is made in the feedback tap weight updating process. Computer simulation results show that the proposed soft decision algorithm nearly meets the ideal DFE (i.e., without erroneous decision) performance, which is far better in performance when compared to the erasure algorithm.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128954216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental Characterization of SOA-Based Wavelength Converters for DPSK Signals 基于soa的DPSK信号波长转换器的实验表征
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344666
S. Gupta, N. Calabretta, G. Contestabile, E. Ciaramella, R. Gangopadhyay
{"title":"Experimental Characterization of SOA-Based Wavelength Converters for DPSK Signals","authors":"S. Gupta, N. Calabretta, G. Contestabile, E. Ciaramella, R. Gangopadhyay","doi":"10.1109/CHINACOM.2006.344666","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344666","url":null,"abstract":"We report a detailed experimental characterization of the wavelength conversion of 10 Gb/s non-return-to-zero differential phase shift keying (NRZ-DPSK) optical signals based on four wave mixing (FWM) in a semiconductor optical amplifier (SOA). The performance of this coherent wavelength converter is compared with theoretical results and found to perform better, in terms of extended range of signal-to-pump ratio (SPR) with lower power penalty, than conventional on-off keying (OOK) and return-to-zero DPSK (RZ-DPSK) signals due to its constant envelope and inherent immunity to data pattern fluctuations.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126582391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
A Novel Joint Detection Algorithm Based on Sphere Decoder for LAS-CDMA System 一种基于球面解码器的LAS-CDMA联合检测算法
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344845
Wenyuan Rao
{"title":"A Novel Joint Detection Algorithm Based on Sphere Decoder for LAS-CDMA System","authors":"Wenyuan Rao","doi":"10.1109/CHINACOM.2006.344845","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344845","url":null,"abstract":"A new reduced-complexity joint detection algorithm based on sphere decoder for LAS-CDMA (large area synchronous code division multiple access) system is proposed in this paper. This algorithm can approach ML performance in polynomial complexity. Special zero correlation window property of LS code can reduce complexity of this algorithm greatly. Simulation indicates it is more insensitive to the choice of initial radius. Thus, by making the choice of radius sufficiently large, the ML solution is guaranteed with low complexity, even for large constellations. We then extend this joint detection algorithm to MIMO case and compare it with MMSE, ZF multicode detectors. Numerical results show performance of this algorithm is good even at very high speed such as 160 Km/h, this give us some insights on developing high efficient practical joint detection algorithm for further LAS-CDMA system.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131251811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
An Image Retrieval Method Based on Content Self-Organized and Interactive 一种基于内容自组织和交互的图像检索方法
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344647
Jianmin Zhao, Ping Fu, Bo Xing, Y. Sun, Yang Du
{"title":"An Image Retrieval Method Based on Content Self-Organized and Interactive","authors":"Jianmin Zhao, Ping Fu, Bo Xing, Y. Sun, Yang Du","doi":"10.1109/CHINACOM.2006.344647","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344647","url":null,"abstract":"How to find the image we need expediently in the tremendous database is one of the most important issues in content-based image retrieval (CBIR). In this paper, we presented an image retrieval system based on image content using fuzzy logic and proposed a new concept on partition the entire database based on content self-organized. In detail, we used modified fuzzy c-means (MFCM) clustering scheme to cluster the database before retrieval and defined a new method to determine the fuzzy weight. To improve the retrieval effectiveness more, this paper also used interactive query (IQ) and presented a new relevance feedback (RF) framework. On all accounts, we designed and implemented a content-based self-organized and interactive retrieval system. Experiments show that it contributes to improving retrieval effectiveness and will be applied in the E-government.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133576618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mobile IPv6 with Multiple Interfaces in Heterogeneous Networks 异构网络下多接口移动IPv6
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344777
Liu Li, Hong Peilin, Lu Hancheng
{"title":"Mobile IPv6 with Multiple Interfaces in Heterogeneous Networks","authors":"Liu Li, Hong Peilin, Lu Hancheng","doi":"10.1109/CHINACOM.2006.344777","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344777","url":null,"abstract":"The development of wireless technologies makes the mobile devices with multiple interfaces possible. Currently, the related research is limited to vertical handoff in heterogeneous networks. Simultaneously using multiple interfaces to communicate is a big challenge, which involves research of link layer and IP layer. We attempt to research mobile IPv6 with multiple interfaces in heterogeneous networks.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115680999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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